#[non_exhaustive]pub struct Condition {
pub attribute_value_list: Option<Vec<AttributeValue>>,
pub comparison_operator: ComparisonOperator,
}Expand description
Represents the selection criteria for a Query or Scan operation:
-
For a
Queryoperation,Conditionis used for specifying theKeyConditionsto use when querying a table or an index. ForKeyConditions, only the following comparison operators are supported:EQ | LE | LT | GE | GT | BEGINS_WITH | BETWEENConditionis also used in aQueryFilter, which evaluates the query results and returns only the desired values. -
For a
Scanoperation,Conditionis used in aScanFilter, which evaluates the scan results and returns only the desired values.
Fields (Non-exhaustive)§
This struct is marked as non-exhaustive
Struct { .. } syntax; cannot be matched against without a wildcard ..; and struct update syntax will not work.attribute_value_list: Option<Vec<AttributeValue>>One or more values to evaluate against the supplied attribute. The number of values in the list depends on the ComparisonOperator being used.
For type Number, value comparisons are numeric.
String value comparisons for greater than, equals, or less than are based on ASCII character code values. For example, a is greater than A, and a is greater than B. For a list of code values, see http://en.wikipedia.org/wiki/ASCII#ASCII_printable_characters.
For Binary, DynamoDB treats each byte of the binary data as unsigned when it compares binary values.
comparison_operator: ComparisonOperatorA comparator for evaluating attributes. For example, equals, greater than, less than, etc.
The following comparison operators are available:
EQ | NE | LE | LT | GE | GT | NOT_NULL | NULL | CONTAINS | NOT_CONTAINS | BEGINS_WITH | IN | BETWEEN
The following are descriptions of each comparison operator.
-
EQ: Equal.EQis supported for all data types, including lists and maps.AttributeValueListcan contain only oneAttributeValueelement of type String, Number, Binary, String Set, Number Set, or Binary Set. If an item contains anAttributeValueelement of a different type than the one provided in the request, the value does not match. For example,{"S":"6"}does not equal{"N":"6"}. Also,{"N":"6"}does not equal{"NS":\["6", "2", "1"\]}. -
NE: Not equal.NEis supported for all data types, including lists and maps.AttributeValueListcan contain only oneAttributeValueof type String, Number, Binary, String Set, Number Set, or Binary Set. If an item contains anAttributeValueof a different type than the one provided in the request, the value does not match. For example,{"S":"6"}does not equal{"N":"6"}. Also,{"N":"6"}does not equal{"NS":\["6", "2", "1"\]}. -
LE: Less than or equal.AttributeValueListcan contain only oneAttributeValueelement of type String, Number, or Binary (not a set type). If an item contains anAttributeValueelement of a different type than the one provided in the request, the value does not match. For example,{"S":"6"}does not equal{"N":"6"}. Also,{"N":"6"}does not compare to{"NS":\["6", "2", "1"\]}. -
LT: Less than.AttributeValueListcan contain only oneAttributeValueof type String, Number, or Binary (not a set type). If an item contains anAttributeValueelement of a different type than the one provided in the request, the value does not match. For example,{"S":"6"}does not equal{"N":"6"}. Also,{"N":"6"}does not compare to{"NS":\["6", "2", "1"\]}. -
GE: Greater than or equal.AttributeValueListcan contain only oneAttributeValueelement of type String, Number, or Binary (not a set type). If an item contains anAttributeValueelement of a different type than the one provided in the request, the value does not match. For example,{"S":"6"}does not equal{"N":"6"}. Also,{"N":"6"}does not compare to{"NS":\["6", "2", "1"\]}. -
GT: Greater than.AttributeValueListcan contain only oneAttributeValueelement of type String, Number, or Binary (not a set type). If an item contains anAttributeValueelement of a different type than the one provided in the request, the value does not match. For example,{"S":"6"}does not equal{"N":"6"}. Also,{"N":"6"}does not compare to{"NS":\["6", "2", "1"\]}. -
NOT_NULL: The attribute exists.NOT_NULLis supported for all data types, including lists and maps.This operator tests for the existence of an attribute, not its data type. If the data type of attribute "
a" is null, and you evaluate it usingNOT_NULL, the result is a Booleantrue. This result is because the attribute "a" exists; its data type is not relevant to theNOT_NULLcomparison operator. -
NULL: The attribute does not exist.NULLis supported for all data types, including lists and maps.This operator tests for the nonexistence of an attribute, not its data type. If the data type of attribute "
a" is null, and you evaluate it usingNULL, the result is a Booleanfalse. This is because the attribute "a" exists; its data type is not relevant to theNULLcomparison operator. -
CONTAINS: Checks for a subsequence, or value in a set.AttributeValueListcan contain only oneAttributeValueelement of type String, Number, or Binary (not a set type). If the target attribute of the comparison is of type String, then the operator checks for a substring match. If the target attribute of the comparison is of type Binary, then the operator looks for a subsequence of the target that matches the input. If the target attribute of the comparison is a set ("SS", "NS", or "BS"), then the operator evaluates to true if it finds an exact match with any member of the set.CONTAINS is supported for lists: When evaluating "
a CONTAINS b", "a" can be a list; however, "b" cannot be a set, a map, or a list. -
NOT_CONTAINS: Checks for absence of a subsequence, or absence of a value in a set.AttributeValueListcan contain only oneAttributeValueelement of type String, Number, or Binary (not a set type). If the target attribute of the comparison is a String, then the operator checks for the absence of a substring match. If the target attribute of the comparison is Binary, then the operator checks for the absence of a subsequence of the target that matches the input. If the target attribute of the comparison is a set ("SS", "NS", or "BS"), then the operator evaluates to true if it does not find an exact match with any member of the set.NOT_CONTAINS is supported for lists: When evaluating "
a NOT CONTAINS b", "a" can be a list; however, "b" cannot be a set, a map, or a list. -
BEGINS_WITH: Checks for a prefix.AttributeValueListcan contain only oneAttributeValueof type String or Binary (not a Number or a set type). The target attribute of the comparison must be of type String or Binary (not a Number or a set type). -
IN: Checks for matching elements in a list.AttributeValueListcan contain one or moreAttributeValueelements of type String, Number, or Binary. These attributes are compared against an existing attribute of an item. If any elements of the input are equal to the item attribute, the expression evaluates to true. -
BETWEEN: Greater than or equal to the first value, and less than or equal to the second value.AttributeValueListmust contain twoAttributeValueelements of the same type, either String, Number, or Binary (not a set type). A target attribute matches if the target value is greater than, or equal to, the first element and less than, or equal to, the second element. If an item contains anAttributeValueelement of a different type than the one provided in the request, the value does not match. For example,{"S":"6"}does not compare to{"N":"6"}. Also,{"N":"6"}does not compare to{"NS":\["6", "2", "1"\]}
For usage examples of AttributeValueList and ComparisonOperator, see Legacy Conditional Parameters in the Amazon DynamoDB Developer Guide.
Implementations§
Source§impl Condition
impl Condition
Sourcepub fn attribute_value_list(&self) -> &[AttributeValue]
pub fn attribute_value_list(&self) -> &[AttributeValue]
One or more values to evaluate against the supplied attribute. The number of values in the list depends on the ComparisonOperator being used.
For type Number, value comparisons are numeric.
String value comparisons for greater than, equals, or less than are based on ASCII character code values. For example, a is greater than A, and a is greater than B. For a list of code values, see http://en.wikipedia.org/wiki/ASCII#ASCII_printable_characters.
For Binary, DynamoDB treats each byte of the binary data as unsigned when it compares binary values.
If no value was sent for this field, a default will be set. If you want to determine if no value was sent, use .attribute_value_list.is_none().
Sourcepub fn comparison_operator(&self) -> &ComparisonOperator
pub fn comparison_operator(&self) -> &ComparisonOperator
A comparator for evaluating attributes. For example, equals, greater than, less than, etc.
The following comparison operators are available:
EQ | NE | LE | LT | GE | GT | NOT_NULL | NULL | CONTAINS | NOT_CONTAINS | BEGINS_WITH | IN | BETWEEN
The following are descriptions of each comparison operator.
-
EQ: Equal.EQis supported for all data types, including lists and maps.AttributeValueListcan contain only oneAttributeValueelement of type String, Number, Binary, String Set, Number Set, or Binary Set. If an item contains anAttributeValueelement of a different type than the one provided in the request, the value does not match. For example,{"S":"6"}does not equal{"N":"6"}. Also,{"N":"6"}does not equal{"NS":\["6", "2", "1"\]}. -
NE: Not equal.NEis supported for all data types, including lists and maps.AttributeValueListcan contain only oneAttributeValueof type String, Number, Binary, String Set, Number Set, or Binary Set. If an item contains anAttributeValueof a different type than the one provided in the request, the value does not match. For example,{"S":"6"}does not equal{"N":"6"}. Also,{"N":"6"}does not equal{"NS":\["6", "2", "1"\]}. -
LE: Less than or equal.AttributeValueListcan contain only oneAttributeValueelement of type String, Number, or Binary (not a set type). If an item contains anAttributeValueelement of a different type than the one provided in the request, the value does not match. For example,{"S":"6"}does not equal{"N":"6"}. Also,{"N":"6"}does not compare to{"NS":\["6", "2", "1"\]}. -
LT: Less than.AttributeValueListcan contain only oneAttributeValueof type String, Number, or Binary (not a set type). If an item contains anAttributeValueelement of a different type than the one provided in the request, the value does not match. For example,{"S":"6"}does not equal{"N":"6"}. Also,{"N":"6"}does not compare to{"NS":\["6", "2", "1"\]}. -
GE: Greater than or equal.AttributeValueListcan contain only oneAttributeValueelement of type String, Number, or Binary (not a set type). If an item contains anAttributeValueelement of a different type than the one provided in the request, the value does not match. For example,{"S":"6"}does not equal{"N":"6"}. Also,{"N":"6"}does not compare to{"NS":\["6", "2", "1"\]}. -
GT: Greater than.AttributeValueListcan contain only oneAttributeValueelement of type String, Number, or Binary (not a set type). If an item contains anAttributeValueelement of a different type than the one provided in the request, the value does not match. For example,{"S":"6"}does not equal{"N":"6"}. Also,{"N":"6"}does not compare to{"NS":\["6", "2", "1"\]}. -
NOT_NULL: The attribute exists.NOT_NULLis supported for all data types, including lists and maps.This operator tests for the existence of an attribute, not its data type. If the data type of attribute "
a" is null, and you evaluate it usingNOT_NULL, the result is a Booleantrue. This result is because the attribute "a" exists; its data type is not relevant to theNOT_NULLcomparison operator. -
NULL: The attribute does not exist.NULLis supported for all data types, including lists and maps.This operator tests for the nonexistence of an attribute, not its data type. If the data type of attribute "
a" is null, and you evaluate it usingNULL, the result is a Booleanfalse. This is because the attribute "a" exists; its data type is not relevant to theNULLcomparison operator. -
CONTAINS: Checks for a subsequence, or value in a set.AttributeValueListcan contain only oneAttributeValueelement of type String, Number, or Binary (not a set type). If the target attribute of the comparison is of type String, then the operator checks for a substring match. If the target attribute of the comparison is of type Binary, then the operator looks for a subsequence of the target that matches the input. If the target attribute of the comparison is a set ("SS", "NS", or "BS"), then the operator evaluates to true if it finds an exact match with any member of the set.CONTAINS is supported for lists: When evaluating "
a CONTAINS b", "a" can be a list; however, "b" cannot be a set, a map, or a list. -
NOT_CONTAINS: Checks for absence of a subsequence, or absence of a value in a set.AttributeValueListcan contain only oneAttributeValueelement of type String, Number, or Binary (not a set type). If the target attribute of the comparison is a String, then the operator checks for the absence of a substring match. If the target attribute of the comparison is Binary, then the operator checks for the absence of a subsequence of the target that matches the input. If the target attribute of the comparison is a set ("SS", "NS", or "BS"), then the operator evaluates to true if it does not find an exact match with any member of the set.NOT_CONTAINS is supported for lists: When evaluating "
a NOT CONTAINS b", "a" can be a list; however, "b" cannot be a set, a map, or a list. -
BEGINS_WITH: Checks for a prefix.AttributeValueListcan contain only oneAttributeValueof type String or Binary (not a Number or a set type). The target attribute of the comparison must be of type String or Binary (not a Number or a set type). -
IN: Checks for matching elements in a list.AttributeValueListcan contain one or moreAttributeValueelements of type String, Number, or Binary. These attributes are compared against an existing attribute of an item. If any elements of the input are equal to the item attribute, the expression evaluates to true. -
BETWEEN: Greater than or equal to the first value, and less than or equal to the second value.AttributeValueListmust contain twoAttributeValueelements of the same type, either String, Number, or Binary (not a set type). A target attribute matches if the target value is greater than, or equal to, the first element and less than, or equal to, the second element. If an item contains anAttributeValueelement of a different type than the one provided in the request, the value does not match. For example,{"S":"6"}does not compare to{"N":"6"}. Also,{"N":"6"}does not compare to{"NS":\["6", "2", "1"\]}
For usage examples of AttributeValueList and ComparisonOperator, see Legacy Conditional Parameters in the Amazon DynamoDB Developer Guide.
Trait Implementations§
impl StructuralPartialEq for Condition
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impl Freeze for Condition
impl RefUnwindSafe for Condition
impl Send for Condition
impl Sync for Condition
impl Unpin for Condition
impl UnwindSafe for Condition
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